Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Class Of Stock [Line Items]
Common stock, shares authorized (in shares)	400,000,000.0	400,000,000.0
Issuance of common stock	$ 228	$ 25
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000
Preferred stock, par value (in dollars per share)	$ 0.0001
Preferred stock, shares outstanding (in shares)	0	0
At-the-Market Facility
Class Of Stock [Line Items]
Common stock, par value (in dollars per share)		$ 0.0001
Sale of stock authorized consideration on transaction		$ 200
Sale of stock, number of shares issued in transaction (in shares)		200,000
Sale of stock, consideration received on transaction		$ 5
Third Stock Purchase Agreement Amendment
Class Of Stock [Line Items]
Capitalized contract cost, gross	$ 5
Gilead | Second Stock Purchase Agreement
Class Of Stock [Line Items]
Issuance of common stock (in shares)		1,000,000
Issuance of common stock		$ 20
Weighted average closing price of our common stock on grant date (in dollars per share)		$ 19.26
Gilead | Third Stock Purchase Agreement Amendment
Class Of Stock [Line Items]
Issuance of common stock (in shares)	15,200,000
Issuance of common stock	$ 320
Weighted average closing price of our common stock on grant date (in dollars per share)	$ 21.00
Premiums earned, net	$ 87
Contract with customer, asset, before allowance for credit loss	228
Capitalized contract cost, gross	$ 5